Siemens CPU 948 User Manual

Shift operations
Operation Operand Function (operation with ACCU 1)
SLW
SRW
SLD
SSW
SSD
RLD
RRD
0 to 15
0 to 15
0 to 32
0 to 15
0 to 32
0 to 32
0 to 32
Shift a word to the left (vacant positions
to the right are padded with zeros)
Shift a word to the right (vacant position
to the left are padded with zeros)
Shift a double word to the left (vacant positions
to the right are padded with zeros)
Shift a word with sign to the right (vacant positions
to the left are padded with the sign - bit 15)
Shift a double word with sign to the right (vacant
positions to the left are padded with the sign - bit 31)
Rotate to the left
Rotate to the right
Only ACCU 1 is involved in the execution of shift operations. The
parameter part of these operations specifies the number of positions by
which the accumulator contents should be shifted or rotated. For the
SLW, SRW and SSW operations, only the low word of ACCU 1 is
involved in the shift operations. For SLD, SSD, RLD and RRD
operations, the entire contents of ACCU 1 (32 bits) are involved.
Shift operations are executed regardless of conditions.
You can use jump operations to scan the value of the last bits shifted
out using CC 1/CC 0.
Shift: last
bit shifted
CC 1 CC 0 Jump operation
000JZ=
1 1 0 JN=
JP=
Table 3-22 Shift operations
Executive Operations
CPU 948 Programming Guide
C79000-G8576-C848-04
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Siemens CPU 948 Specifications

General

Brand	Siemens
Model	CPU 948
Category	Controller
Language	English